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(No Model.)

- H. W. ARMSTRONG.

JACK. No. 539,909. Patented May 28, 1895.

' mvem'on In: mums PETERS ca. PHdl'O-UTHQ. wAsnmsmm o. n.

UNITED STATES PATENT OFFICE.

HARRY W. ARMSTRONG, O15 OAKMONT, PENNSYLVANIA.

JACK.

SPECIFICATION forming part of Letters Patent No. 539,909, dated May 28,1895.

Application filed December 11, 1894- Serial No. 531,473. (No model.)

To all whom it may concern:

Be it known that I, HARRY W. ARMSTRONG, of Oakmont, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Jacks, of which the following is a full, clear, and exactdescription, reference being bad to the accompanying drawing, formingpart of this specification, which represents a side elevation, partlybroken away, of my improved jack.

My invention relates to the class of jacks, and is designed to provide asimple, cheap and effective device for jacking-up rails or for similarpurposes.

In the drawing, 2 represents the base,3 the hollow casing, and 4 theratchetbar guided therein. This bar is provided with grooves 5 upon itssides, into which project fins upon thecasing, which hold the bar inplace in its vertical movements, and at its lower end is'a projectingrest 6 for the rail or other part to be lifted. To actuate the bar, Iprovide an operating lever 7, which is pivoted in the easing, and isprovided at its inner end with a pivoted pawl 8, having adownwardly-projecting tail-piece which may be engaged by a link 9, whichis pivoted between downwardly projecting lugs 10 upon the lever, andwhich normally occupies the inoperative position shown in dotted linesin the drawing, but which, when swung into the position shown in fulllines, engages a recess in the tail of the pawl. S, and holds the .pawlin such position that it will engage a second pawl 11, which is pivotedin the casing just above the lever-pivot.

In this position, when the lever is lowered, both pawls will be forcedback, thus releasing the ratchet-bar, and allowing it to drop,

while in normal position the pawls Work alternately in the ordinarymanner.

The advantages of my invention will be appreciated by those skilled inthe art, since the device is compact, simple and easily operated.

An eccentric may be used in place of the link, and many other variationsmay be made by the skilled mechanic without departing from my invention;since What I claim as new is- 1. A jack having a casing, a ratchet barmovable therein, an operating lever, a pawl pivoted to the lever, aswinging stop arranged to engage thelever-pawl in certain positions, anda second pawl pivoted in the casing above the lever and arranged to beengaged by the lower pawl; substantially as described.

2. A jack having a casing, a ratchet-bar movable therein, an operatinglever, a pawl pivoted to the inwardly projecting end of the lever, astop. pivoted to a downward extension of the lever and projectingthrough the easing, and asecond pawl pivoted in the casing above thelever pivot and arranged to be engaged by the lower pawl; substantiallyas described.

In testimony whereof I have hereunto set my hand.

HARRY W. ARMSTRONG.

Witnesses: a

W. B. CORWIN, O. BYRNES.

